Update dependency Serilog.Sinks.Async to 2.1.0 (#12870)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Directory.Packages.props

@@ -60,7 +60,7 @@
     <PackageVersion Include="Serilog.AspNetCore" Version="8.0.3" />
     <PackageVersion Include="Serilog.Enrichers.Thread" Version="4.0.0" />
     <PackageVersion Include="Serilog.Settings.Configuration" Version="8.0.4" />
-    <PackageVersion Include="Serilog.Sinks.Async" Version="2.0.0" />
+    <PackageVersion Include="Serilog.Sinks.Async" Version="2.1.0" />
     <PackageVersion Include="Serilog.Sinks.Console" Version="6.0.0" />
     <PackageVersion Include="Serilog.Sinks.File" Version="6.0.0" />
     <PackageVersion Include="Serilog.Sinks.Graylog" Version="3.1.1" />